Communications over multiple protocol interfaces in a computing environment

ABSTRACT

According to one aspect of the present disclosure a system and technique for communications over multiple protocol interfaces in a computing environment is disclosed. The system includes a processor and logic executable by the processor to: identify a network interface for egress data packet communications; responsive to the identified network interface differing from a data packet fragmentation technique desired for the data packet communications, derive fragmentation data according to the desired data packet fragmentation technique; generate an application layer header for the data packet communications; store values of the fragmentation data in select fields of the application layer header; fragment the data packet communications according to the desired data packet fragmentation protocol; and transmit the data packet communications including the application layer header over the identified network interface.

BACKGROUND

In a clustered or other type of computing environment, communicationredundancy may be maintained at a data fragmentation level. That is, alarge packet of data may be split or fragmented into suitable sizepackets or fragments to be communicated over a wide range ofcommunication interfaces. The fragments are transmitted over thedifferent communication interfaces from an originating node to adestination node. At the receiving node, the packets or fragments arere-assembled. This redundancy technique ensures that even if oneinterface goes down in the midst of transferring packets, the necessarypacket fragments reach the destination node through other interfaces. Atthe destination node, a network interface device may re-assemble thepackets even if the packet fragments are received from differentinterfaces. In a clustered or computing environment where the IPtopology is heterogeneous, nodes in the environment must be aware of thedifferent versions of IP topologies to process the fragmentation logic.

BRIEF SUMMARY

According to one aspect of the present disclosure a system and techniquefor communications over multiple protocol interfaces in a computingenvironment is disclosed. The system includes a processor and logicexecutable by the processor to: identify a network interface for egressdata packet communications; responsive to the identified networkinterface differing from a data packet fragmentation technique desiredfor the data packet communications, derive fragmentation data accordingto the desired data packet fragmentation technique; generate anapplication layer header for the data packet communications; storevalues of the fragmentation data in select fields of the applicationlayer header; fragment the data packet communications according to thedesired data packet fragmentation protocol; and transmit the data packetcommunications including the application layer header over theidentified network interface.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

For a more complete understanding of the present application, theobjects and advantages thereof, reference is now made to the followingdescriptions taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 is an embodiment of a network of data processing systems in whichthe illustrative embodiments of the present disclosure may beimplemented;

FIG. 2 is an embodiment of a data processing system in which theillustrative embodiments of the present disclosure may be implemented;

FIG. 3 is a diagram illustrating an embodiment of a computingenvironment in which illustrative embodiments of the present disclosuremay be implemented;

FIG. 4 is a diagram illustrating a datagram for an IPv4 InternetProtocol header;

FIG. 5 is a diagram illustrating an embodiment of an application layerheader according to the present disclosure;

FIG. 6 is a diagram illustrating a data processing system configured forcommunications over multiple network interfaces according to the presentdisclosure;

FIG. 7 is a flow diagram illustrating an embodiment of a method forcommunications over multiple protocol interfaces in a computingenvironment according to the present disclosure; and

FIG. 8 is a flow diagram illustrating another embodiment of a method forcommunications over multiple protocol interfaces in a computingenvironment according to the present disclosure.

DETAILED DESCRIPTION

Embodiments of the present disclosure provide a method, system andcomputer program product for communications over multiple protocolinterfaces in a computing environment. For example, in some embodiments,the method and technique includes: identifying a network interface foregress data packet communications; responsive to the identified networkinterface differing from a data packet fragmentation technique desiredfor the data packet communications, deriving fragmentation dataaccording to the desired data packet fragmentation technique; generatingan application layer header for the data packet communications; storingvalues of the fragmentation data in select fields of the applicationlayer header; fragmenting the data packet communications according tothe desired data packet fragmentation protocol; and transmitting thedata packet communications including the application layer header overthe identified network interface. Thus, embodiments of the presentdisclosure enable a desired data packet fragmentation technique (e.g.,IPv4) to be applied to traffic over a different, incompatible interface(e.g., IPv6) by including certain fragmentation information in anapplication layer header, thereby enabling re-assembly of the logicalpacket even though the packet was communicated using a protocolunsupported by the communication interface. Thus, by utilizinginformation extracted from certain header fields corresponding to aparticular network interface protocol and storing those values in anapplication layer header used in communications over an incompatibleinterface, compatibility between the different interfaces is obtainedsuch that fragments of a greater logical packet can be interchanged(e.g., for re-assembly) regardless of the interface used fortransmission/receipt.

As will be appreciated by one skilled in the art, aspects of the presentdisclosure may be embodied as a system, method or computer programproduct. Accordingly, aspects of the present disclosure may take theform of an entirely hardware embodiment, an entirely software embodiment(including firmware, resident software, micro-code, etc.) or anembodiment combining software and hardware aspects that may allgenerally be referred to herein as a “circuit,” “module” or “system.”Furthermore, aspects of the present disclosure may take the form of acomputer program product embodied in one or more computer readablemedium(s) having computer readable program code embodied thereon.

Any combination of one or more computer usable or computer readablemedium(s) may be utilized. The computer readable medium may be acomputer readable signal medium or a computer readable storage medium. Acomputer readable storage medium may be, for example but not limited to,an electronic, magnetic, optical, electromagnetic, infrared, orsemiconductor system, apparatus, or device, or any suitable combinationof the foregoing. More specific examples (a non-exhaustive list) of thecomputer readable storage medium would include the following: anelectrical connection having one or more wires, a portable computerdiskette, a hard disk, a random access memory (RAM), a read-only memory(ROM), an erasable programmable read-only memory (EPROM or Flashmemory), an optical fiber, a portable compact disc read-only memory(CD-ROM), an optical storage device, a magnetic storage device, or anysuitable combination of the foregoing. In the context of this document,a computer readable storage medium may be any tangible medium that cancontain, or store a program for use by or in connection with aninstruction execution system, apparatus or device.

A computer readable signal medium may include a propagated data signalwith computer readable program code embodied therein, for example, inbaseband or as part of a carrier wave. Such a propagated signal may takeany of a variety of forms, including, but not limited to,electro-magnetic, optical, or any suitable combination thereof. Acomputer readable signal medium may be any computer readable medium thatis not a computer readable storage medium and that can communicate,propagate, or transport a program for use by or in connection with aninstruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmittedusing any appropriate medium, including but not limited to wireless,wireline, optical fiber cable, RF, etc., or any suitable combination ofthe foregoing.

Computer program code for carrying out operations for aspects of thepresent disclosure may be written in any combination of one or moreprogramming languages, including an object oriented programming languagesuch as Java, Smalltalk, C++ or the like and conventional proceduralprogramming languages, such as the “C” programming language or similarprogramming languages. The program code may execute entirely on theuser's computer, partly on the user's computer, as a stand-alonesoftware package, partly on the user's computer and partly on a remotecomputer or entirely on the remote computer or server. In the latterscenario, the remote computer may be connected to the user's computerthrough any type of network, including a local area network (LAN) or awide area network (WAN), or the connection may be made to an externalcomputer (for example, through the Internet using an Internet ServiceProvider).

Aspects of the present disclosure are described below with reference toflowchart illustrations and/or block diagrams of methods, apparatus(systems) and computer program products according to embodiments of thedisclosure. It will be understood that each block of the flowchartillustrations and/or block diagrams, and combinations of blocks in theflowchart illustrations and/or block diagrams, can be implemented bycomputer program instructions. These computer program instructions maybe provided to a processor of a general purpose computer, specialpurpose computer, or other programmable data processing apparatus toproduce a machine, such that the instructions, which execute via theprocessor of the computer or other programmable data processingapparatus, create means for implementing the functions/acts specified inthe flowchart and/or block diagram block or blocks.

These computer program instructions may also be stored in acomputer-readable medium that can direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer-readablemedium produce an article of manufacture including instruction meanswhich implement the function/act specified in the flowchart and/or blockdiagram block or blocks.

The computer program instructions may also be loaded onto a computer orother programmable data processing apparatus to cause a series ofoperational steps to be performed on the computer or other programmableapparatus to produce a computer implemented process such that theinstructions which execute on the computer or other programmableapparatus provide processes for implementing the functions/actsspecified in the flowchart and/or block diagram block or blocks.

With reference now to the Figures and in particular with reference toFIGS. 1-2, exemplary diagrams of data processing environments areprovided in which illustrative embodiments of the present disclosure maybe implemented. It should be appreciated that FIGS. 1-2 are onlyexemplary and are not intended to assert or imply any limitation withregard to the environments in which different embodiments may beimplemented. Many modifications to the depicted environments may bemade.

FIG. 1 is a pictorial representation of a network of data processingsystems in which illustrative embodiments of the present disclosure maybe implemented. Network data processing system 100 is a network ofcomputers in which the illustrative embodiments of the presentdisclosure may be implemented. Network data processing system 100contains network 130, which is the medium used to provide communicationslinks between various devices and computers connected together withinnetwork data processing system 100. Network 130 may include connections,such as wire, wireless communication links, or fiber optic cables.

In some embodiments, server 140 and server 150 connect to network 130along with data store 160. Server 140 and server 150 may be, forexample, IBM® Power Systems™ servers. In addition, clients 110 and 120connect to network 130. Clients 110 and 120 may be, for example,personal computers or network computers. In the depicted example, server140 provides data and/or services such as, but not limited to, datafiles, operating system images, and applications to clients 110 and 120.Network data processing system 100 may include additional servers,clients, and other devices.

In the depicted example, network data processing system 100 is theInternet with network 130 representing a worldwide collection ofnetworks and gateways that use the Transmission ControlProtocol/Internet Protocol (TCP/IP) suite of protocols to communicatewith one another. At the heart of the Internet is a backbone ofhigh-speed data communication lines between major nodes or hostcomputers, consisting of thousands of commercial, governmental,educational and other computer systems that route data and messages. Ofcourse, network data processing system 100 also may be implemented as anumber of different types of networks, such as for example, an intranet,a local area network (LAN), or a wide area network (WAN). FIG. 1 isintended as an example, and not as an architectural limitation for thedifferent illustrative embodiments.

FIG. 2 is an embodiment of a data processing system 200 such as, but notlimited to, client 110 and/or server 140 in which an embodiment of asystem for supporting communications over incompatible protocolinterfaces according to the present disclosure may be implemented. Inthis embodiment, data processing system 200 includes a bus orcommunications fabric 202, which provides communications betweenprocessor unit 204, memory 206, persistent storage 208, communicationsunit 210, input/output (I/O) unit 212, and display 214.

Processor unit 204 serves to execute instructions for software that maybe loaded into memory 206. Processor unit 204 may be a set of one ormore processors or may be a multi-processor core, depending on theparticular implementation. Further, processor unit 204 may beimplemented using one or more heterogeneous processor systems in which amain processor is present with secondary processors on a single chip. Asanother illustrative example, processor unit 204 may be a symmetricmulti-processor system containing multiple processors of the same type.

In some embodiments, memory 206 may be a random access memory or anyother suitable volatile or non-volatile storage device. Persistentstorage 208 may take various forms depending on the particularimplementation. For example, persistent storage 208 may contain one ormore components or devices. Persistent storage 208 may be a hard drive,a flash memory, a rewritable optical disk, a rewritable magnetic tape,or some combination of the above. The media used by persistent storage208 also may be removable such as, but not limited to, a removable harddrive.

Communications unit 210 provides for communications with other dataprocessing systems or devices. In these examples, communications unit210 is a network interface card. Modems, cable modem and Ethernet cardsare just a few of the currently available types of network interfaceadapters. Communications unit 210 may provide communications through theuse of either or both physical and wireless communications links.

Input/output unit 212 enables input and output of data with otherdevices that may be connected to data processing system 200. In someembodiments, input/output unit 212 may provide a connection for userinput through a keyboard and mouse. Further, input/output unit 212 maysend output to a printer. Display 214 provides a mechanism to displayinformation to a user.

Instructions for the operating system and applications or programs arelocated on persistent storage 208. These instructions may be loaded intomemory 206 for execution by processor unit 204. The processes of thedifferent embodiments may be performed by processor unit 204 usingcomputer implemented instructions, which may be located in a memory,such as memory 206. These instructions are referred to as program code,computer usable program code, or computer readable program code that maybe read and executed by a processor in processor unit 204. The programcode in the different embodiments may be embodied on different physicalor tangible computer readable media, such as memory 206 or persistentstorage 208.

Program code 216 is located in a functional form on computer readablemedia 218 that is selectively removable and may be loaded onto ortransferred to data processing system 200 for execution by processorunit 204. Program code 216 and computer readable media 218 form computerprogram product 220 in these examples. In one example, computer readablemedia 218 may be in a tangible form, such as, for example, an optical ormagnetic disc that is inserted or placed into a drive or other devicethat is part of persistent storage 208 for transfer onto a storagedevice, such as a hard drive that is part of persistent storage 208. Ina tangible form, computer readable media 218 also may take the form of apersistent storage, such as a hard drive, a thumb drive, or a flashmemory that is connected to data processing system 200. The tangibleform of computer readable media 218 is also referred to as computerrecordable storage media. In some instances, computer readable media 218may not be removable.

Alternatively, program code 216 may be transferred to data processingsystem 200 from computer readable media 218 through a communicationslink to communications unit 210 and/or through a connection toinput/output unit 212. The communications link and/or the connection maybe physical or wireless in the illustrative examples.

The different components illustrated for data processing system 200 arenot meant to provide architectural limitations to the manner in whichdifferent embodiments may be implemented. The different illustrativeembodiments may be implemented in a data processing system includingcomponents in addition to or in place of those illustrated for dataprocessing system 200. Other components shown in FIG. 2 can be variedfrom the illustrative examples shown. For example, a storage device indata processing system 200 is any hardware apparatus that may storedata. Memory 206, persistent storage 208, and computer readable media218 are examples of storage devices in a tangible form.

FIG. 3 is a diagram illustrating a clustered network environment 300 inwhich an embodiment of a system for supporting communications overmultiple protocol interfaces according to the present disclosure may beimplemented. In the illustrated embodiment, environment 300 includesnodes 310 and 312 connectable to each other via a number of differenttypes of communication network interfaces 314. In the illustratedembodiment, two nodes 310 and 312 are illustrated; however, it should beunderstood that the quantity and interface connections between thevarious nodes of the clustered environment may vary. Any number ofcommunication network topologies may be used for communication networkinterfaces 314. For example, a widely known protocol of a network layerfor the Transmission Control Protocol/Internet Protocol is an InternetProtocol. In the illustrated embodiment, interfaces include an IPv4(Internet Protocol version 4) network 320, an IPv6 (Internet Protocolversion 6) network 322 and a storage area network (SAN) 324; however, itshould be understood that other types of communication interfaces may beused. Nodes 310 and 312 may be physically located in close proximity toeach other or remotely located.

In a clustered or other type of environment, communication redundancymay be maintained at a data fragmentation level. That is, a large packetof data may be split or fragmented into suitable size packets orfragments to be communicated over a wide range of communicationinterfaces. The fragments are transmitted over the differentcommunication interfaces from an originating node (e.g., node 310) to adestination node (e.g., node 312). At the receiving node, the packets orfragments are re-assembled. In some instances, the fragments may arrivein random order. This redundancy technique ensures that even if oneinterface goes down in the midst of transferring packets, the necessarypacket fragments reach the destination node through other interfaces. Atthe destination node, a network interface device may re-assemble thepackets even if the packet fragments are received from differentinterfaces. However, in a clustered environment where the IP topology isheterogeneous, such as environment 300, nodes in the environment must beaware of the different versions of IP topologies to process thefragmentation logic.

FIG. 4 is a diagram illustrating the structure of an IPv4 header 400datagram format. As illustrated in FIG. 4, IPv4 header 400 includes anumber of different fields of varying bit length relaying various typesof information corresponding to the data packet. For example, header 400includes a field 402 containing a version number of the protocol (e.g.,“4”), a field 404 containing a length of the header 400 itself, and afield 406 comprising information indicating the service quality ofcommunications processing. A field 408 indicates a size of the packet, afield 410 includes an identifier or unique number used to identify theframe and any associated fragments for reassembly, and a field 412containing flags that specify the function of the frame in terms ofwhether fragmentation has been employed, additional fragments arecoming, or this is the final fragment. A field 414 identifies thefragment offset (i.e., information indicating where the divided data(i.e., the fragments) have been positioned within the original data(e.g., the position of a particular fragment's data in relation to thefirst byte of data)), a field 416 indicating a time during which thepacket may exist on the network, a field 418 indicating whichupper-layer protocol receives incoming packets after IP processing, afield 420 containing a checksum of the IP header, a field 422 specifyingthe sending node, and a field 424 specifying the receiving node.

In a heterogeneous network topology, however, the fragmentation schemeor technique for one interface may be unsupported by or incompatiblewith a different interface. For example, the fragmentation techniqueused in the IPv4 protocol is unsupported by or incompatible with theIPv6 protocol interfaces. Embodiments of the present disclosure enable asingle data fragmentation technique to be utilized across differentnetwork protocols. In the description herein, an exemplary embodiment ofthe present disclosure as applied to the IPv4 and IPv6 protocols isprovided; however, it should be understood that embodiments of thepresent disclosure may be used with other types of dissimilar orincompatible network interfaces.

FIG. 5 is a diagram illustrating an embodiment of an application layerheader 500 of a TCP/IP protocol. In a clustered environment, such asenvironment 300, header 500 may be referenced as a cluster header orother designation containing protocols and/or other types of informationfor process-to-process communications between clustered nodes. In theillustrated embodiment, header 500 includes a base portion 502 includingone or more fields that may be application-specific along withfragmentation fields 510 and 512 containing information corresponding toa particular data fragmentation technique. For example, in theillustrated embodiment, an IPv4 fragmentation technique is employed forcommunications across an IPv6 network interface. However, becausevarious aspects of the IPv4 fragmentation algorithm are incompatiblewith the IPv6 protocol interfaces, certain types of informationassociated with the IPv4 protocol are included in the application layerheader 500 to enable data packets transmitted over and received from anIPv6 interface to be fragmented and re-assembled based on the IPv4protocol. Thus, for example, in the illustrated embodiment, fields 510and 512 comprise information corresponding to the fields 410 and 414 ofthe IPv4 datagram header, respectively (i.e., the identifier or uniquenumber used to identify the fragments of a logical packet, and thefragment offset or position within the logical packet). In thisembodiment, fields 510 and 512 each comprise 16-bit fields,respectively, that may be extensions of an existing header or maycomprise reserved or previously unused fields of an existing header. Itshould be understood that the size of fields 510 and/or 512 may bevaried. Further, the quantity of fields and types of informationincluded in the respective fields may vary based on the particularprotocol fragmentation information needed. Additionally, it should beunderstood that location of fields 510 and 512 within header 500 mayvary.

In some embodiments of the present disclosure, a common maximumtransmission unit (MTU) size of data packets compatible with both thedesired interfaces and satisfying the least minimum data sizerequirements needed to participate across the desired interfaces isselected for data fragmentation. The desired fragmentation technique(e.g., IPv4) is applied to traffic of a different, incompatibleinterface (e.g., IPv6) by utilizing fields 510 and 512 introduced in theapplication layer header 500. Thus, by utilizing information extractedfrom fields 510 and 512 of application layer header 500, compatibilitybetween the different interfaces is obtained such that fragments of agreater logical packet can be interchanged (e.g., for re-assembly)regardless of the interface used for transmission/receipt. Accordingly,embodiments of the present disclosure enable a simplified clustercommunications software stack as only one fragmentationalgorithm/technique needs to be used and maintained.

FIG. 6 is an illustrative embodiment of a system 600 for supportingmultiple Internet protocol interfaces. System 600 may be implemented ondata processing systems or platforms such as, but not limited to,servers 140 and/or 150, clients 110 and/or 120, or at other dataprocessing system locations. For example, in the embodiment illustratedin FIG. 6, system 600 comprises a data processing node 602 (e.g.,servers 140 and/or 150, clients 110 and/or 120, and/or other types ofdata processing systems) having a network interface 604. Networkinterface 604 may comprise a network interface card or other type ofdevice for transmitting/receiving communications relative to a networkinterface. In the illustrated embodiment, network interface 604 includesan processor unit 610 and a memory 612. In FIG. 6, memory 612 includesinterface logic 620 and fragmentation data 622. Fragmentation data 622may comprise information associated with a particular data fragmentationtechnique that is extracted from and/or embedded in application layerheader 500 to facilitate fragmentation and re-assembly acrossincompatible network interfaces. For example, in the context of an IPv4fragmentation technique to be used across an IPv6 interface,fragmentation data 622 may include information gathered during logicalpacket fragmentation corresponding to fields 410 and 414 that arethereafter inserted into fields 510 and 512 of an application layerheader 500 for the logical packet fragment. Fragmentation data 622 mayalso include information corresponding to a common MTU that satisfiesthe minimum fragment size requirements for the desired networkinterfaces.

Interface logic 620 may be implemented in any suitable manner usingknown techniques that may be hardware-based, software-based, or somecombination of both. For example, interface logic 620 may comprisesoftware, logic and/or executable code for performing various functionsas described herein (e.g., residing as software and/or an algorithmrunning on a processor unit, hardware logic residing in a processor orother type of logic chip, centralized in a single integrated circuit ordistributed among different chips in a data processing system).

Interface logic 620 is used to store values corresponding to fields 410and 414 into fields 510 and 512, respectively, of application layerheader 500 for egress communications on an IPv6 interface. Interfacelogic 620 also continues to write the values from fields 410 and 414into their respective positions in the IPv4 header for communicationstransmitted over IPv4 interfaces. Interface logic 620 is also used foringress communications such that, for communications received over anIPv6 interface, interface logic 620 extracts the values from fields 510and 512 of application layer header 500 to facilitate re-assembly of thelogical data packet according to the IPv4 fragmentation/re-assemblytechnique. Similarly, interface logic 620 derives the values from fields410 and 414 (as well as other header information from header 400) forre-assembly of logical packets received over an IPv4 interface.Interface logic 620 is also configured to fragment the logical packetusing a common MTU that satisfies the least minimum packet sizecorresponding to the desired network interfaces (e.g., a common MTU tobe used for both IPv4 and IPv6 interfaces).

FIG. 7 is a flow diagram illustrating an embodiment of a method forsupporting communications over multiple protocol interfaces in acomputing environment. The method begins at block 702, where a networkinterface for egress communication of data packets is identified. Atdecisional block 704, a determination is made whether the identifiedinterface is incompatible with the fragmentation technique beingutilized. For example, if an IPv4 fragmentation technique is beingutilized and the identified interface is an IPv6 interface, adetermination is made that the protocols for the respective interfacesare different and/or incompatible. If at decisional block 704 it isdetermined that the identified interface is compatible with thefragmentation technique being utilized (e.g., an IPv4 interface using anIPv4 fragmentation technique), the method proceeds to block 706, wherethe logical packet is fragmented according to the desired fragmentationtechnique using a common MTU size based on the different networkinterfaces being utilized. If at decisional block 704 it is determinedthat the identified interface is incompatible with the fragmentationtechnique being utilized, the method proceeds to block 708, where the acommon MTU size based on the different network interfaces being utilizedis selected/identified. At block 710, the logical packet is fragmentedaccording to the desired fragmentation technique (e.g., IPv4). At block712, fragmentation data is derived based on the desired fragmentationtechnique. For example, using an IPv4 fragmentation technique forcommunications over an IPv6 interface, values corresponding to whatwould be fields 410 and 414 of a corresponding IPv4 header 400 for thepacket would be derived. At block 714, application layer header 500 isgenerated. At block 716, the fragmentation data derived at block 712 isinserted to respective fields of application layer header 500 (e.g., inan IPv4 fragmentation technique for communicating over an IPv6interface, values corresponding to fields 410 and 414 of the IPv4 headerwould be stored as the values in fields 510 and 512 of application layerheader 500). In the above-described method, it should be understood thatin some embodiments, the process performed at block 704 may be omitted.For example, in some embodiments, based on the identified type ofinterface or the particular type of interface being used fortransmitting the logical packet, the method may proceed directly toblock 706 or 708 depending on the interface being used for egresscommunications.

FIG. 8 is a flow diagram illustrating an embodiment of a method forsupporting communications over multiple protocol interfaces in acomputing environment. The method begins at block 802, where a networkinterface for ingress of communication data packets is identified. Atdecisional block 804, a determination is made whether the identifiedinterface is incompatible with the fragmentation technique beingutilized. For example, if an IPv4 fragmentation technique is beingutilized and the identified interface is an IPv6 interface, adetermination is made that the protocols for the respective interfacesare different and/or incompatible. If at decisional block 804 it isdetermined that the identified interface is compatible with thefragmentation technique being utilized (e.g., an IPv4 interface using anIPv4 fragmentation technique), the method proceeds to block 806, wherethe logical packet is re-assembled normally (e.g., fragmentation datafor a packet fragmented using the IPv4 technique is derived from theIPv4 header and re-assembled according to the IPv4 protocol). If atdecisional block 804 it is determined that the identified interface isincompatible with the fragmentation technique being utilized, the methodproceeds to block 808, where fragmentation data is derived from theapplication layer header 500 (e.g., derived from fields 510 and 512). Atblock 810, the logical packet is re-assembled using the derivedfragmentation data. In the above-described method, it should beunderstood that in some embodiments, the process performed at block 804may be omitted. For example, in some embodiments, based on theidentified type of interface or the particular type of interfacereceiving data communications, the method may proceed directly to block806 or 808 depending on the interface being used for ingresscommunications.

Thus, embodiments of the present disclosure enable a desired data packetfragmentation technique (e.g., IPv4) to be applied to traffic over adifferent, incompatible interface (e.g., IPv6) by including certainfragmentation information in an application layer header, therebyenabling re-assembly of the logical packet even though the packet wascommunicated using a protocol unsupported by the communicationinterface. Thus, by utilizing information extracted from certain headerfields corresponding to a particular network interface protocol andstoring those values in an application layer header used incommunications over an incompatible interface, compatibility between thedifferent interfaces is obtained such that fragments of a greaterlogical packet can be interchanged (e.g., for re-assembly) regardless ofthe interface used for transmission/receipt. Accordingly, embodiments ofthe present disclosure enable a simplified cluster communicationssoftware stack as only one fragmentation algorithm/technique needs to beused and maintained.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting of the disclosure.As used herein, the singular forms “a”, “an” and “the” are intended toinclude the plural forms as well, unless the context clearly indicatesotherwise. It will be further understood that the terms “comprises”and/or “comprising,” when used in this specification, specify thepresence of stated features, integers, steps, operations, elements,and/or components, but do not preclude the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or groups thereof.

The corresponding structures, materials, acts, and equivalents of allmeans or step plus function elements in the claims below are intended toinclude any structure, material, or act for performing the function incombination with other claimed elements as specifically claimed. Thedescription of the present disclosure has been presented for purposes ofillustration and description, but is not intended to be exhaustive orlimited to the disclosure in the form disclosed. Many modifications andvariations will be apparent to those of ordinary skill in the artwithout departing from the scope and spirit of the disclosure. Theembodiment was chosen and described in order to best explain theprinciples of the disclosure and the practical application, and toenable others of ordinary skill in the art to understand the disclosurefor various embodiments with various modifications as are suited to theparticular use contemplated.

The flowchart and block diagrams in the Figures illustrate thearchitecture, functionality, and operation of possible implementationsof systems, methods and computer program products according to variousembodiments of the present invention. In this regard, each block in theflowchart or block diagrams may represent a module, segment, or portionof code, which comprises one or more executable instructions forimplementing the specified logical function(s). It should also be notedthat, in some alternative implementations, the functions noted in theblock may occur out of the order noted in the figures. For example, twoblocks shown in succession may, in fact, be executed substantiallyconcurrently, or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved. It will also be notedthat each block of the block diagrams and/or flowchart illustration, andcombinations of blocks in the block diagrams and/or flowchartillustration, can be implemented by special purpose hardware-basedsystems that perform the specified functions or acts, or combinations ofspecial purpose hardware and computer instructions.

What is claimed is:
 1. A system, comprising: a processor; and hardwareinterface logic executable by the processor to: identify a firstcommunications protocol of a network interface for egress data packetcommunications; responsive to the identified first communicationsprotocol of the network interface differing from a second communicationsprotocol to be used for the data packet communications, derivefragmentation data according to a data packet fragmentation protocolcorresponding to the second communications protocol; generate anapplication layer header for the data packet communications; storevalues of the fragmentation data in select fields of the applicationlayer header; fragment the data packet communications according to thedata packet fragmentation protocol; and transmit the data packetcommunications including the application layer header over the networkinterface.
 2. The system of claim 1, wherein the logic is executable toderive the fragmentation data to include a common maximum transmissionunit size for the data packet communications satisfying the data packetfragmentation protocol and a data packet fragmentation protocol based onthe identified first communications protocol of the network interface.3. The system of claim 1, wherein the logic is executable to derive thefragmentation data to include an identifier value and a fragment offsetvalue.
 4. The system of claim 3, wherein the logic is executable tostore the identifier value and the fragment offset value in selectfields of the application layer header.
 5. The system of claim 1,wherein the logic is executable to: responsive to receiving data packetcommunications over the identified network interface, extractfragmentation data from an application layer header of the received datapacket communications; and reassemble a logical packet from the receiveddata packet communications using the data packet fragmentation protocoland the fragmentation data.
 6. The system of claim 5, wherein the logicis executable to: extract an identifier value from the application layerheader; and extract a fragment offset value from the application layerheader.
 7. A computer program product for communications over multipleprotocol interfaces in a computing environment, the computer programproduct comprising: a non-transitory computer readable medium havingcomputer readable program code embodied therewith, the computer readableprogram code comprising computer readable program code configured to:identify a first communications protocol of a network interface foregress data packet communications; responsive to the identified firstcommunications protocol of the network interface differing from a secondcommunications protocol to be used for the data packet communications,derive fragmentation data according to a data packet fragmentationprotocol corresponding to the second communications protocol; generatean application layer header for the data packet communications; storevalues of the fragmentation data in select fields of the applicationlayer header; fragment the data packet communications according to thedata packet fragmentation protocol; and transmit the data packetcommunications including the application layer header over the networkinterface.
 8. The computer program product of claim 7, wherein thecomputer readable program code is configured to derive the fragmentationdata to include a common maximum transmission unit size for the datapacket communications satisfying the data packet fragmentation protocoland a data packet fragmentation protocol based on the identified firstcommunications protocol of the network interface.
 9. The computerprogram product of claim 7, wherein the computer readable program codeis configured to derive the fragmentation data to include an identifiervalue and a fragment offset value.
 10. The computer program product ofclaim 9, wherein the computer readable program code is configured tostore the identifier value and the fragment offset value in selectfields of the application layer header.
 11. The computer program productof claim 7, wherein the computer readable program code is configured to:responsive to receiving data packet communications over the identifiednetwork interface, extract fragmentation data from an application layerheader of the received data packet communications; and reassemble alogical packet from the received data packet communications using thedata packet fragmentation protocol and the fragmentation data.
 12. Thecomputer program product of claim 11, wherein the computer readableprogram code is configured to: extract an identifier value from theapplication layer header; and extract a fragment offset value from theapplication layer header.
 13. A system, comprising: a processor; andhardware interface logic executable by the processor to: identify afirst protocol network interface and a second network protocol interfacefor egress data packet communications; identify a desired data packetfragmentation protocol for the data packet communications, the desireddata packet fragmentation protocol corresponding to the first protocolnetwork interface but incompatible with the second network protocolinterface; derive fragmentation data according to the desired datapacket fragmentation protocol; generate a first header for the datapacket communications to be transmitted over the first protocol networkinterface; store values of the fragmentation data into respectivepositions in the first header according to the first protocol networkinterface; generate a second header for the data packet communicationsto be transmitted over the second protocol network interface; storevalues of the fragmentation data in unused fields of the second header;fragment the data packet communications according to the desired datapacket fragmentation protocol; and transmit the data packetcommunications including the first header over the first protocolnetwork interface; and transmit the data packet communications includingthe second header over the second protocol network interface.